Hanyū weather in October

In October, Hanyū sees average daytime highs of 21°C and overnight lows near 14°C, with 206 mm of rain across 13.7 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 19°C by the end. The sky is clear or mostly clear about 32% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Hanyū's 7th-clearest and 8th-windiest month. For the whole year in context, see Hanyū's year-round climate.

Daytime high
21°
6th warmest
Overnight low
14°
7th coldest
Rainfall
206 mm
13.7 wet days
Daylight
11 h 06 min
5:55 AM – 4:59 PM
Cloud cover
60%
7th clearest
Wind
6 km/h
8th windiest
Solar energy
2.91 kWh/m²
Travel score
5.9
out of 10

Hanyū is city in Saitama Prefecture, Japan.

Density
1,001/km²
people per km²
Founded
1954

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 19°C by the end.

A typical October day in Hanyū reaches about 21°C in the afternoon and slips back to 14°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 24°C. Set against its neighbours, October runs about 6°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12317
22317
32316
42316
52316
62216
72216
82215
92215
102215
112215
122115
132114
142114
152114
162114
172113
182013
192013
202013
212012
222012
232012
241912
251912
261911
271911
281911
291911
301810
311810

How October really feels in Hanyū

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hanyū weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°556.129.81.6
Feb / 536.92.310.62.0
Mar13° / 10411.81.511.73.5
Apr18° / 12112.20.212.95.4
May23° / 14°15313.7013.96.1
Jun25° / 18°18716.7014.45.3
Jul29° / 22°22018.8014.24.3
Aug30° / 23°17116.4013.44.1
Sep26° / 20°22116.7012.25.3
Oct21° / 14°20613.7011.15.9
Nov15° / 838.6010.15.0
Dec10° / 516.70.49.62.8

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33961
44060
54060
64060
74159
84159
94258
104357
114456
124456
134456
144555
154654
164654
174753
184951
194951
204951
215050
225149
235347
245446
255545
265644
275743
285842
295941
306040
316139

Chance of precipitation in October

Any precipitation

Hanyū gets around 206 mm of rain over 13.7 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 44% and peaks near 51% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
151
251
350
450
550
649
749
849
948
1047
1147
1246
1345
1445
1544
1643
1743
1842
1942
2042
2141
2241
2340
2439
2539
2638
2737
2837
2936
3035
3134

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the dry band about 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1212736132
2232835131
3242934121
4262933111
5283032101
630303191
732302990
834302780
937302670
1040302460
1143302160
1245301950
1348291750
1452291540
1554281440
1657281230
1759271130
186326920
196525820
206724720
217023610
227321510
237520410
247619410
257818310
268017300
278216200
288315200
298414200
308613100
318712100

Wind in October

Winds average 6 km/h in October.

Across October, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 5:42 AM to 6:10 AM, and sunset from 5:20 PM to 4:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:425:20
211.65:435:18
311.65:435:17
411.55:445:16
511.55:455:14
611.45:465:13
711.45:475:11
811.45:485:10
911.35:495:08
1011.35:505:07
1111.35:505:06
1211.25:515:04
1311.25:525:03
1411.15:535:01
1511.15:545:00
1611.15:554:59
1711.05:564:57
1811.05:574:56
1911.05:584:55
2010.95:594:54
2110.96:004:52
2210.86:014:51
2310.86:024:50
2410.86:034:49
2510.76:044:48
2610.76:054:47
2710.76:064:46
2810.66:074:44
2910.66:084:43
3010.66:094:42
3110.56:104:41

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.91 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 5.08 kWh/m² in May across the year — October's 2.91 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
103.0Moderate
113.0Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
262.9Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in October

Hazard calendar for Hanyū

In seasonPeak

In October, Hanyū sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Hanyū's rainy season runs March–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Hanyū?

Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.9
Sightseeing
2nd-best month of the year
3.4
Beach & pool
6th-best month of the year

October is a reasonable time to visit Hanyū for sightseeing.

What to pack for Hanyū in October

From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In October, Hanyū sees daytime highs around 21°C and nights near 14°C. Worth packing: rain gear. About 14 days see rain.

rain gear

Sea temperature near Hanyū in October

The nearest coast averages about 22°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 68 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Hanyū in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hanyū peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 16UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Hanyū in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Hanyū is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Hanyū?

Hanyū sits at 36.2°N, 139.5°E, 18 m above sea level, in Japan. The nearest listed city is Ōwa, 5.0 km away.

Topography around Hanyū

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hanyū.

Within 3 km, the terrain around Hanyū has only modest variations in elevation — a maximum elevation change of 24 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 92 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,552 m.

The land around Hanyū is covered by artificial surfaces (48%) and cropland (40%) within 3 km, cropland (46%) and artificial surfaces (39%) within 16 km, and trees (51%) and artificial surfaces (26%) within 80 km.

3 km
24 m
16 km
92 m
80 km
2,552 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
October weather nearby: Ōwa 5.0 km · Gyōda 7.0 km · Kazo 8.0 km · Kisai 9.0 km · Tatebayashi 9.0 km · Fukiage-fujimi 11 km · Kōnosu 11 km · Shōbu 13 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hanyū (36.1667°, 139.5333°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).